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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'fea8d8b073460c1b0b933b4f502e219dc9102f5df0d21c49cb95c20159707b53' 
  AND token = 'yXHfHVCdqXHTWi7eyBTUAAh8qk7DVT2CSbefws6jl/8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}